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Astronomical Numbers

Guess the number of zeros
Quiz by
cuotak
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Last updated: October 12, 2013
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First submittedOctober 12, 2013
Times taken468
Average score72.2%
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Hint
Number
n
World population in 2013
7 x 10n
9
US debt ceiling in 2013
US$1.67 x 10n
13
World total GDP in 2012
US$7 x 10n
13
Global CO2 emission in 2012
3.6 x 10n tonnes
10
Number of websites in 2013
4 x 10n
9
Number of YouTube hits on Gangnam Style (as of Oct 2013)
1.8 x 10n
9
Number of insect species
6-10 x 10n
6
Number of bacteria on Earth
5 x 10n
30
Age of Earth
4.54 x 10n years
9
Age of Universe
1.38 x 10n years
10
Number of stars in Milky Way
4 x 10n
11
Speed of light
3 x 10n m/s
8
Astronomical Unit (average Earth-Sun distance)
1.5 x 10n m
11
Lightyear
9.5 x 10n m
15
Number of neurons in adult's brain
1 x 10n
11
Number of base pairs in human genome
3 x 10n
9
Mole (Avogadro constant, i.e. number of atoms in 12g carbon-12)
6 x 10n
23
Number of electrons per second in 1 Amp
6.24 x 10n
18
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